perf hist: Remove symbol.h from hist.h, just fwd decls are needed

To reduce the includes dependencies.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-cmvg5ght75mmfg1efeyna9rn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/gtk/annotate.c

@@ -5,6 +5,7 @@
 #include "util/annotate.h"
 #include "util/evsel.h"
 #include "util/map.h"
+#include "util/symbol.h"
 #include "ui/helpline.h"
 #include <inttypes.h>
 #include <signal.h>